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<h1 class="entry-title">Descendant Selector ("ancestor descendant")</h1>
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						所属分类：<span class="category"><a href="/category/selectors/">选择器</a> &gt; <a href="/category/selectors/hierarchy-selectors/">层级</a></span>
<span class="pull-right">英文文档：<a href="https://api.jquery123.com/descendant-selector/" target="_blank">Descendant Selector ("ancestor descendant")</a></span>
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<article class="entry selector" id="descendant1"><h2 class="section-title"><span>descendant selector</span></h2>
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<p class="desc"><strong>描述: </strong>选择给定的祖先元素的所有后代元素。</p>
<ul class="signatures"><li class="signature">
<h4 class="name">
<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>jQuery( "ancestor descendant" )</h4>
<p class="argument"><strong>ancestor: </strong>任何有效的选择器。</p>
<p class="argument"><strong>descendant: </strong>一个用来筛选后代元素的选择器。</p>
</li></ul>
<div class="longdesc" id="entry-longdesc">
<p>    一个元素的后代可能是该元素的一个孩子，孙子，曾孙等。</p>
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<section class="entry-examples" id="entry-examples"><header><h2 class="underline">例子:</h2></header><div class="entry-example" id="example-0">
<h4><span class="desc">查找所有表单下的input后代元素。</span></h4>
<div class="syntaxhighlighter xml ">
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<pre><div class="container"><div class="line"><code><span class="doctype">&lt;!DOCTYPE html&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">html</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">head</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">style</span>&gt;</span><span class="css"></span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code>  <span class="tag">body</span> <span class="rules">{ <span class="rule"><span class="attribute">font-size</span>:<span class="value"><span class="number">14</span>px;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">form</span> <span class="rules">{ <span class="rule"><span class="attribute">border</span>:<span class="value"><span class="number">2</span>px green solid;</span></span> <span class="rule"><span class="attribute">padding</span>:<span class="value"><span class="number">2</span>px;</span></span> <span class="rule"><span class="attribute">margin</span>:<span class="value"><span class="number">0</span>;</span></span></span></code></div></div><div class="container"><div class="line"><code>         <span class="rule"><span class="attribute">background</span>:<span class="value"><span class="hexcolor">#efe</span>;</span></span> <span class="rule">}</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">div</span> <span class="rules">{ <span class="rule"><span class="attribute">color</span>:<span class="value">red;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">fieldset</span> <span class="rules">{ <span class="rule"><span class="attribute">margin</span>:<span class="value"><span class="number">1</span>px;</span></span> <span class="rule"><span class="attribute">padding</span>:<span class="value"><span class="number">3</span>px;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;/<span class="title">style</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">script</span> <span class="attribute">src</span>=<span class="value">"https://code.jquery.com/jquery-latest.js"</span>&gt;</span><span class="javascript"></span><span class="tag">&lt;/<span class="title">script</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">head</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">body</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">form</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>    <span class="tag">&lt;<span class="title">div</span>&gt;</span>Form is surrounded by the green outline<span class="tag">&lt;/<span class="title">div</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>    <span class="tag">&lt;<span class="title">label</span>&gt;</span>Child:<span class="tag">&lt;/<span class="title">label</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>    <span class="tag">&lt;<span class="title">input</span> <span class="attribute">name</span>=<span class="value">"name"</span> /&gt;</span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code>    <span class="tag">&lt;<span class="title">fieldset</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>      <span class="tag">&lt;<span class="title">label</span>&gt;</span>Grandchild:<span class="tag">&lt;/<span class="title">label</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>      <span class="tag">&lt;<span class="title">input</span> <span class="attribute">name</span>=<span class="value">"newsletter"</span> /&gt;</span></code></div></div><div class="container"><div class="line"><code>    <span class="tag">&lt;/<span class="title">fieldset</span>&gt;</span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;/<span class="title">form</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  Sibling to form: <span class="tag">&lt;<span class="title">input</span> <span class="attribute">name</span>=<span class="value">"none"</span> /&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">script</span>&gt;</span><span class="javascript">$(<span class="string">"form input"</span>).css(<span class="string">"border"</span>, <span class="string">"2px dotted blue"</span>);</span><span class="tag">&lt;/<span class="title">script</span>&gt;</span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">body</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">html</span>&gt;</span></code></div></div></pre>
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<h4>Demo:</h4>
<div class="demo code-demo"></div>
</div></section>
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